cannot open preferences dialog
This is turning into a nightmare. I updated to photoshop/lightroom 2018 and I have various problems. One of which is I cannot open the preferences dialog now. e.g. If I choose Preferences->Performance I just get warning dialog saying 'an integer between 96 and 8 is required. Closest value inserted' and I cannot get rid of the dialog. The preferences dialog does not appear
tried this solution and it also worked for Photoshop CC 2018
\HKEY_CURRENT_USER\Software\Adobe\Photoshop\120.0Added DWORD "OverridePhysicalMemoryMB" with the value "4000" decimal bas (=24 GB RAM = my installed RAM).